Private groups would get really interesting. A little down the line I think, but I'm excited for the possibilities here. I've been mulling this over (looking at Reddit as a model for Inbound); private/public groups by industry/specialism/location could get really awesome.

This shows Google Analytics from the Saturday we transferred the new site onto Inbound.org. You can see the spike two days after as Monday (also SearchLove London) hit.

First thoughts...

It's awesome to see growth in visits and uniqute visitors, and to see more engagement in terms of page views.

The decreased time on site I can live with. So long as the engagement on each visit remains high (something we're working on as the moderating team at the moment), this isn't so much of an issue. It's still around

I think it's great now I think pushing gamification and incentives for commenting/social sharing inbound's pages is a good way to go. Most of your users are twitter power users and could bring a lot more users IF they tweeted you more.